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LetterePatent No. 78,781, dated yJune 9, 18ti8 .'v

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To ALL WnoM 1r MAY concerts: Y Be it known that I, THeM/ls P'. AKRS, offNew York city, `in .the Stateof New York, have invented an 4Improved Boiler-Alarm; and I do hereby declare that thefollowing is ya full and exact description thereof,

reference-being had to thesecompanyingdrawings, making part of this application;

Figure lis an elevation of my improved alarimshowing the parts in position for 'sounding :au alarmnt either low water or high pressure of steam. v l Y i Figure' 2 is 4a. vertical centrnl section of the improved alarm, together with aside view of the plate Z and the studs R, R., and S, to .which the alarm is made fast.

Similar letters of reference indicatecorresponding parts in the several figures.

My invention consists of a. low-water and high-pressure indicator for steam-boilers, in which the adjusting-` parts are so constructed and arranged -as to Vbevlocked in their adjusted position, independent of nny'covering or other surrounding devices, and in theeombination of the parte composing it, together with the arrangement of the parts.

To enable others skilled inthe art tovmnke and use my improved boiler-alarm, I will proceed to deseribeits construction and operation.

In iig. 1, A represents' a tube, which I propose to make of brass or any other suitable metal, andwhioh should be about eighteen inches long. About the end of` this tube is fitted a collar, m, which is provided with a. base, a and'a, end made fast to the boiler by means of screws, which pass through the said base, as represented in fig. 1. On each side of the collar 'm there arejam-nuts to,h old it h'rmly in its place. At the other end of the tube A is a collar, n, similar to m, which is large enough to permit the` tube A -'to move forward and back through it, according as the tube expands or contracts. This collar, like m, is provided with a bese, which isv 'made fast to the plate Z, by means of screv's, and is intended simply to act as a support and guide for the tube A. There is also fitted on the tube A, an annular collar, 1o, which is provided with au arm, H, jointed to the short arm of the levei- I. The collar w' is held in its place by jam-nuts on each side ef it, as represented in the drawing.

The levers Iand K are-pivoted to the plate Z', by means of thestuds It audit', which areffastened to the said plate Z'by nuts tapped and screwed on behind, as represented in iig. 2. `These levers, I and. K, are conncted by means of Ia bar, z', whiclris jointed theretofas represent-ed in iig. `The rod O has one of its ends I jointed to the lever K at p, and its other end passes through the lever L, and is vprovided with aunt, T, which is tapped Iand screwed upon it; The nut T has eight recesses, and the end 0f the lever L is provided with a square hole, corresponding with these recesses, through which a 'boltpasses, and is fastened securely in ite place by means of thclock V. l l

To the end of thcV tube Ais attached an elbow, q, on the top of which is screwedwhat is usually called a T, (which `in' the drawing is marked G,)'fromwhich theV connection with fthe boiler, above the line of high water, is made. In the part C, is inserted, at the top, an ordinary steam-whistle, E. Above the steam-whistle E, and supportedby the same standard, is a shell, F, contaihing a spiral spring, YW, as shown in vtig. 2. This spiral spring, W, rests on the nut X, which is tapped on the; stem Y of the valve Y,"and is compressed and held down by the cap G, which is tapped and screwed onto 'the shell F. The cap G is provided with recesses, as shownin g.1, and marked gg g. The whistle isprovided with a valve, Y', which seats downward, es shown in iig. 2, and is kept closed by the spiral spring W. 0n the top of the Vstein Y of the val-ve Y is screwed thel part M, which is slotted so as treceive the lever L.

Above the cap G of the shell Ffand enclosing the part M, is ring or collar, N, whichhas in it a groove to match the slot in the part M, in which the lever L rests when in position. The ring or collar N is provided with ajcurved arm,`which 4fits into the recesses g g g of the cap G, and passes down through-an eye, n', which ismade fast in the whistle E. "The lever L is perforated at L', sov as to admit a cord, by pulling which the whistle may lie-sounded at any time. The head of the bolt U is made to t intothe recesses of the nut T, so

that it cannot be screwed on or oi when the bolt is in its place. The lever L has a joint at 1, lso constructed' 'farsi 2 as that the lever becomes rigid, when either end of it is depressed, but yields when the end L iseleVated.

The object of this invention is twofold. In the first place it affords certain and reliable means of rindicating low water and high pressure of steam, and in the second place itsmec'hanicalconstruction is such `that it cannot be tampered with or put out of order, when it is `onceadjusted and locked,'without Vdestroying some part ot' its mechanism.

Having explained the mechanical construction of my invention, a very few words will suffice to show its operation.

Whenthe water in the boiler falls below the plane in which the tube A lies,'the water in the tube will run into the boiler, and the tube will bc filled with steann The steam being of a greaterhent than the water, the

tube A will expand, and being held rmly in its place at one end, by the'collar m, which is made fast to the boiler, it must of courseexpand in the other direction; This expansion will communicate motion to the short arm of the lever I, which motion will be multiplied in proportion to the relative lengths of the short andlong arms, and transmittedrst to the lever K, and thence to the'lever L, which will open the valve of the whistle.

Vthus allowing the .steam to escape and sound an alarm.

Again, when( the steam-pressure upon the. valve Y exceeds the pressure of the spiral spring W, which act as before explained, upon the same valve in the reverse-direction, the valve will again open, allowing the sten totescape and give an alarm', as before.

Finally, by elevating the end L' of the lever L, the valve may be opened, and the whistle sounded at any tiv What I claim as new, and desire to secure by Letters Patent, isv 1. A low'll-waterand high-pressure indicator, in which .the adjusting-parts areso. constructed and arrangas to be locked in their adjusted position, independent 'ot' any covering or. otherr surrounding devices, substai. tially in the manner' shown and described. Y

2. -The combination of the expansible tube A, with the/levers I and K, the jointed .lever L, and the part M, together withV their connections and fastenings, substantially as and'for the purpose set forth.

3. The combination ofthe inverted valveY, the valve-stem Y, the nut X, the cap G, the spiral spring W,.and the whistle E, substantially as shown and described'.

I hen combined with the 4. The tube A, and the levers I, K, and L, with their connections vand fastenings, w invertedvalve Y', the valve-stem Y, the nut X, the cap G, and the spiral spring'W, whereby to produce the double eli'ect of indicating low water and excessive pressure of steam, substantially as herein set forth.'

` In witnesswhereof, I hereto set my hand, this 22d day of May, A. D. 1868.

' l THos. P. AKERS.

Witnesses:

'JOHN C. ANDERSON,

P. D. RoDDEY. 

